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typedef struct {
/* Virtual methods */
glong (* get_length) (GdaBlobOp *op);
glong (* read) (GdaBlobOp *op, GdaBlob *blob, glong offset, glong size);
glong (* write) (GdaBlobOp *op, GdaBlob *blob, glong offset);
gboolean (* write_all) (GdaBlobOp *op, GdaBlob *blob);
} GdaBlobOpFunctions;